Try your mobile phone... (Score 3, Interesting)

If you own a SonyEricsson P800 or soon P900, try Leif Wilden's excellent Oggplay ( http://www.geocities.com/p800tools/ ) It's also available for Nokia's Series60 phones (7650, 3650, N-Gage) though as far as I can tell it only supports 16kHz playback for now. It's an excellent choice for the upcoming Siemens SX1 though where it supports the full 44.1kHz. And it's open source as well ( http://sourceforge.net/projects/symbianoggplay/ )